Humans have lived in Tonga for perhaps 3,000 years, since settlement in late Lapita times. Before the arrival of European explorers in the late 17th and early 18th centuries, the Tongans had frequent contacts with their nearest oceanic neighbours, Fiji and Niue. In the 19th century, with the arrival of Western traders and missionaries, Tongan culture changed especially in religion so that today almost 98% of residents are Christian. The people discarded some old beliefs and habits, and adopted others.
Contemporary Tongans often have strong ties to overseas lands. Many Tongans have emigrated to Australia, New Zealand, or the United States to seek employment and a higher standard of living. U.S. cities with significant Tongan American populations include Seattle, Washington; Portland, Oregon; Anchorage, Alaska; Inland Empire, California; San Mateo, California; East Palo Alto, California; San Bruno, California; Oakland, California; San Jose, California; Inglewood, California; Los Angeles, California; Salt Lake City, Utah; Kona, Hawaii; Lahaina, Hawaii; Reno, Nevada; St. Petersburg, Florida; and Euless, Texas (in the Dallas/Fort Worth metroplex). Large Tongan communities also live in Tutuila (American Samoa), in Auckland (New Zealand) and in Melbourne and Sydney (Australia). It is estimated that as many as 100,000 Tongans live overseas. In New Zealand alone there are approximately 50,000 Tongan people. The Tongan diaspora retains close ties to relatives at home, and a significant portion of Tonga's income derives from remittances to family members (often aged) who prefer to remain in Tonga
